A VIDEO LAYERED CODING AND DECODING METHOD AND A CODING AND DECODING DEVICE IN INTERLACED MODE

摘要

A video layered coding method, a coding and decoding device in an interlaced mode are provided, which can improve the inter-layer predictive coding and decoding efficiency in the interlaced mode, and further improve the video compression efficiency. In an i->p mode, an interlaced frame in a base layer is divided into fields, and a frame in an enhanced layer is predicted with a corresponding field in time according to the corresponding relationship on the time axis; in a p->i mode, two successive frames in the base layer corresponding to two fields in the enhanced layer on the time axis are interlaced to form one frame, and then the interlaced frame in the enhanced layer is predicted. An optional frame prediction method, that is, an interlaced frame is not selected to be divided into fields, but is directly used to predict the corresponding frame in the enhanced layer, is also provided for video streams with different characteristics. In the case that the inter-layer frame rate is consistent, the corresponding relationship in time is used to perform the prediction, but in the case that the inter-layer frame rate is inconsistent, adjacent frames or fields on the time axis are used to perform the inter-layer predictive coding and decoding.